Li2S/carbon nanocomposite strips from a lowerature conversion of Li2SO4 as high-performance lithium-sulfur cathodes

Fangmin Ye; Hyungjun Noh; Jinhong Lee; Hongkyung Lee; Hee Tak Kim

doi:10.1039/c8ta00515j

Li₂S/carbon nanocomposite strips from a lowerature conversion of Li₂SO₄ as high-performance lithium-sulfur cathodes

Fangmin Ye
, Hyungjun Noh
, Jinhong Lee
, Hongkyung Lee
, Hee Tak Kim

Department of Energy and Science and Engineering

Korea Advanced Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

The carbothermal conversion of Li₂SO₄ provides a cost-effective strategy to fabricate high-capacity Li₂S cathodes; however, Li₂S cathodes derived from Li₂SO₄ at high temperatures (>800 °C), having high crystallinity and large crystal size, result in a low utilization of Li₂S. Here, we report Li₂SO₄/poly(vinyl alcohol)-derived Li₂S/carbon nanocomposite (Li₂S@C) strips at a record low temperature of 635 °C. These Li₂S@C nanocomposite strips as a cathode show a low initial activation potential (2.63 V), a high initial discharge capacity (805 mA h g^-1 Li₂S) and a high cycling stability (0.2C and 1C). These improved results could be ascribed to the nano-sized Li₂S particles as well as their low crystallinity due to the PVA-induced carbon network and the low conversion temperature, respectively. An XPS analysis reveals that the CC and CO bonds derived from the carbonization of PVA can promote the conversion of Li₂SO₄ at such a low temperature.

Original language	English
Pages (from-to)	6617-6624
Number of pages	8
Journal	Journal of Materials Chemistry A
Volume	6
Issue number	15
DOIs	https://doi.org/10.1039/c8ta00515j
State	Published - 2018

Bibliographical note

Publisher Copyright:
© 2018 The Royal Society of Chemistry.

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10.1039/c8ta00515j

Cite this

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title = "Li2S/carbon nanocomposite strips from a lowerature conversion of Li2SO4 as high-performance lithium-sulfur cathodes",

abstract = "The carbothermal conversion of Li2SO4 provides a cost-effective strategy to fabricate high-capacity Li2S cathodes; however, Li2S cathodes derived from Li2SO4 at high temperatures (>800 °C), having high crystallinity and large crystal size, result in a low utilization of Li2S. Here, we report Li2SO4/poly(vinyl alcohol)-derived Li2S/carbon nanocomposite (Li2S@C) strips at a record low temperature of 635 °C. These Li2S@C nanocomposite strips as a cathode show a low initial activation potential (2.63 V), a high initial discharge capacity (805 mA h g-1 Li2S) and a high cycling stability (0.2C and 1C). These improved results could be ascribed to the nano-sized Li2S particles as well as their low crystallinity due to the PVA-induced carbon network and the low conversion temperature, respectively. An XPS analysis reveals that the CC and CO bonds derived from the carbonization of PVA can promote the conversion of Li2SO4 at such a low temperature.",

author = "Fangmin Ye and Hyungjun Noh and Jinhong Lee and Hongkyung Lee and Kim, \{Hee Tak\}",

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T1 - Li2S/carbon nanocomposite strips from a lowerature conversion of Li2SO4 as high-performance lithium-sulfur cathodes

AU - Ye, Fangmin

AU - Noh, Hyungjun

AU - Lee, Jinhong

AU - Lee, Hongkyung

AU - Kim, Hee Tak

PY - 2018

Y1 - 2018

N2 - The carbothermal conversion of Li2SO4 provides a cost-effective strategy to fabricate high-capacity Li2S cathodes; however, Li2S cathodes derived from Li2SO4 at high temperatures (>800 °C), having high crystallinity and large crystal size, result in a low utilization of Li2S. Here, we report Li2SO4/poly(vinyl alcohol)-derived Li2S/carbon nanocomposite (Li2S@C) strips at a record low temperature of 635 °C. These Li2S@C nanocomposite strips as a cathode show a low initial activation potential (2.63 V), a high initial discharge capacity (805 mA h g-1 Li2S) and a high cycling stability (0.2C and 1C). These improved results could be ascribed to the nano-sized Li2S particles as well as their low crystallinity due to the PVA-induced carbon network and the low conversion temperature, respectively. An XPS analysis reveals that the CC and CO bonds derived from the carbonization of PVA can promote the conversion of Li2SO4 at such a low temperature.

AB - The carbothermal conversion of Li2SO4 provides a cost-effective strategy to fabricate high-capacity Li2S cathodes; however, Li2S cathodes derived from Li2SO4 at high temperatures (>800 °C), having high crystallinity and large crystal size, result in a low utilization of Li2S. Here, we report Li2SO4/poly(vinyl alcohol)-derived Li2S/carbon nanocomposite (Li2S@C) strips at a record low temperature of 635 °C. These Li2S@C nanocomposite strips as a cathode show a low initial activation potential (2.63 V), a high initial discharge capacity (805 mA h g-1 Li2S) and a high cycling stability (0.2C and 1C). These improved results could be ascribed to the nano-sized Li2S particles as well as their low crystallinity due to the PVA-induced carbon network and the low conversion temperature, respectively. An XPS analysis reveals that the CC and CO bonds derived from the carbonization of PVA can promote the conversion of Li2SO4 at such a low temperature.

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